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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280f9d7fb969010edeea658cd46ed28dfbb560ea2ddb9c0129eaa5f506eb7df6' 
  AND token = 'zeZv17gGZWb7w2ehsxX3BZYvqU0Nj48X/1PIJZofL/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}